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O: Fachverband Oberflächenphysik
O 90: Sensing, Active Structures and other Applications
O 90.3: Vortrag
Donnerstag, 19. März 2015, 15:30–15:45, MA 144
Light-induced field enhancement in polyacenes — •Luca Bursi1,2, Arrigo Calzolari2,3, Stefano Corni2, and Elisa Molinari1,2 — 1Dipartimento di Fisica, Informatica e Matematica, Università di Modena e Reggio Emilia, I-41125 Modena, Italy — 2Istituto Nanoscienze CNR-NANO-S3, I-41125 Modena, Italy — 3Department of Physics, University of North Texas, Denton, TX 76203
High attention has been devoted recently to the optical, absorption and plasmonic properties of C-based nanostructures (i.e., graphene-derived), in view of their possible applications as sensors, amplifier antenna and light harvesting devices, alternative to standard metallic systems (e.g. Au, Ag). The way the excitation properties transform, scaling down from macro- to nano-systems, is far from being understood, and it is a field of great current interest.
Using (TD)DFT first-principles approaches, we studied the electric field enhancement in single and coupled polyacene molecules, upon illumination [1]. We demonstrate that optical transitions may generate oscillating dipolar response charge, giving rise to an induced electric field near the molecule, which thus acts as a plasmon-like nanoantenna. While the field amplification in the vicinity of single acenes is rather small and decreases when the size of the system is increased, it may be selectively enhanced in the case of acenes' assemblies. This paves the way for the design of more complex C-based architectures explicitly conceived to improve the amplification factor.
[1] L. Bursi et al., ACS Photonics, 1, (2014) 1049.